week03 - ECE 3150 Spring 2009 Week 3 Recitation Ask for...

ECE 3150Spring 2009Week 3 RecitationAsk for Homework questions first on Homework 2 (you can choose to do Work problems below first)Additional Work problems:1.For a piece of semiconductor under equilibrium at room temperature which contains NA=1017cm-3and ND=1015cm-3, what is the best estimate for the electron concentration, assuming ni= 1010cm-3and complete ionization of dopants? (Teach ways to estimate without using a calculator)(a) 103cm-3(b) 1010cm-3(c) 1015cm-3(d) 9.9×1016cm-3(e) 1017cm-32.Same semiconductor from Question 2, what is the hole concentration?3.Same semiconductor as Prob. 2. If we apply an electric field, what will be the species that will contribute most to the electric current?4.Same from Prob. 2, what is the electrostatic potential at equilibrium? Is it negative or positive? Draw the band diagram as a graphical method.

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